test: improve test coverage for plugin-coverage #6179

Job	Run time
Linter	1m 9s
Integration tests (windows-latest)	1m 48s
Unit tests (ubuntu-latest)	52s
Unit tests (macos-latest)	1m 4s
Integration tests (ubuntu-latest)	52s
Format check	48s
Unit tests (windows-latest)	1m 48s
Integration tests (macos-latest)	51s
E2E tests (macos-latest)	1m 52s
E2E tests (windows-latest)	2m 47s
E2E tests (ubuntu-latest)	1m 37s
Build	1m 36s
	17m 4s

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